[dev.power64] code review 152570049: all: merge default into dev.power64

src/runtime/string_test.go

 // Copyright 2012 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 package runtime_test
 
 import (
         "runtime"
         "strings"
         "testing"
@@ skipping 127 matching lines @@
 import "strings"
 func main() {
         s0 := strings.Repeat("0", 1<<10)
         s1 := strings.Repeat("1", 1<<10)
         s2 := strings.Repeat("2", 1<<10)
         s3 := strings.Repeat("3", 1<<10)
         s := s0 + s1 + s2 + s3
         panic(s)
 }
 `
+
+func TestGostringnocopy(t *testing.T) {
+        max := *runtime.Maxstring
+        b := make([]byte, max+10)
+        for i := uintptr(0); i < max+9; i++ {
+                b[i] = 'a'
+        }
+        _ = runtime.Gostringnocopy(&b[0])
+        newmax := *runtime.Maxstring
+        if newmax != max+9 {
+                t.Errorf("want %d, got %d", max+9, newmax)
+        }
+}